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Research progress of metal solid phase additive manufacturing based on friction stir
SHI Lei, LI Yang, XIAO Yichen, WU Chuansong, LIU Huijie
Journal of Materials Engineering    2022, 50 (1): 1-14.   DOI: 10.11868/j.issn.1001-4381.2021.000741
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Solid phase additive manufacturing based on friction stir is a new technology for manufacturing of large lightweight alloy components, which has become one of the hot research topics in advanced manufacturing field at home and abroad.The research status of metal solid phase additive manufacturing technology based on friction stir and related process mechanism were analyzed and summarized. The solid phase additive manufacturing technology based on friction stir can be divided into three categories.One is friction stir additive manufacturing(FSAM), which is based on the principle of friction stir lap welding, the plates are stacked layer by layer. Another is additive friction stir deposition(AFSD) technology, which usually uses a hollow tool to conduct AFSD by additive powder or wire through the hollow.The third one is friction surfacing deposition additive manufacturing (FSD-AM) technology, which is based on the principle of friction surfacing by using a rotating consumable bar to deposit materials to form the designed components. The research and application status of solid phase additive manufacturing technology of metal materials based on friction stir were analyzed, and the characteristics, advantages and disadvantages of three kinds of solid phase additive manufacturing technology based on friction stir were compared.Finally, the future research direction of solid phase additive manufacturing technology based on friction stir was proposed, including revealing their process mechanism, integrated controlling of the formation and property of the AM components, modifying the process assisted with second energy, application of new materials and optimization with artificial intelligence, etc.
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Research progress in graphene based thermal conductivity materials
LI Yue, LI Jiong-li, ZHU Qiao-si, LIANG Jia-feng, GUO Jian-qiang, WANG Xu-dong
Journal of Materials Engineering    2021, 49 (11): 1-13.   DOI: 10.11868/j.issn.1001-4381.2020.000935
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As a two-dimensional(2D) building block of new materials, graphene has received widespread attention due to its exceptional thermal properties. The thermal properties and recent advances on graphene-based material were reviewed. The intrinsic thermal conductivity of graphene and the effect of layers, defects and edge were briefly introduced. The resent research progress in graphene fiber as thermal conductivity material was analyzed and discussed. A variety of graphene films (graphene film, graphene hybrid film, graphene/polymer composite film) were grouped by category and the influencing factors of the thermal conductivity were reviewed. The structure, thermal conductivity property and current researches of 3D graphene (graphene with random orientation in the polymer matrix, graphene with specific orientation in the polymer matrix) were summarized. Finally, the challenges and prospects of graphene-based materials were also pointed out, especially inhigh power, highly integrated systems such as LED lighting and smart phones, graphene based thermal conductivity materials have a good development prospect.
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Research progress in high entropy alloys by additive manufacturing
WEI Shui-miao, MA Pan, JI Peng-cheng, MA Yong-chao, WANG Can, ZHAO Jian, YU Zhi-shui
Journal of Materials Engineering    2021, 49 (10): 1-17.   DOI: 10.11868/j.issn.1001-4381.2020.000820
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Based on different high-entropy alloys (HEAs) systems, the latest research progress in additive manufactured high-entropy alloys was reviewed. The rapid solidification microstructure, segregation and precipitation behaviors of high-entropy alloys fabricated by additive manufacturing with different compositions were described. Especially, the analysis was focused on the mechanical properties, deformation and strengthening mechanisms. It was pointed out that the appropriate additive manufacturing process should be selected for different high-entropy alloy systems, and the influencing factors of forming quality need to be further studied. Finally, it was proposed that high-entropy alloys with both excellent strength and high plasticity can be developed and prepared by additive manufacturing technology.
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Progress in structure design and preparation of porous electrodes for lithium ion batteries
WANG Chenyang, ZHANG Anbang, CHANG Zenghua, WU Shuaijin, LIU Zhi, PANG Jing
Journal of Materials Engineering    2022, 50 (1): 67-79.   DOI: 10.11868/j.issn.1001-4381.2021.000021
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With the increasing demand for lithium-ion batteries, lithium-ion batteries with high energy density and high power density have become one of the research hotspots. Material modification and new material development can effectively increase the energy density of lithium-ion batteries. In addition, the microstructure parameters of the electrode such as porosity, pore size and distribution, tortuosity and electrode composition distribution are also factors that determine the performance of the electrode and battery. Improving the performance of high specific energy batteries by optimizing the electrode structure design has gradually become the focus of attention. The research progress of porous electrode structure design optimization for lithium ion batteries was reviewed in this article, the design factors and preparation methods of porous electrode structure were summarized. Then the future development of electrode structure design optimization and the promotion of novel preparation technologies for large-scale application in the field of high specific energy lithium ion batteries were prospected in the field of high specific energy lithium ion batteries.
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Applications of two dimensional material MXene in water treatment
ZHANG Wen-juan, KOU Miao
Journal of Materials Engineering    2021, 49 (9): 14-26.   DOI: 10.11868/j.issn.1001-4381.2021.000097
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MXene,very recently emerging family of two-dimensional (2D) transition metal carbides and/or nitrides,have attracted a wide range of attention due to unique layered structure,hydrophilicity,high conductivity and catalytic activity.First,synthesis and various applications of MXene in adsorption,photocatalysis and membrane separation were summarized in this review.Then,the effects of structure control,surface modification and composite of MXene on the adsorption performance of MXene and the formation of effective heterojunction,the exposure of active crystal face and the deposition of precious metals on the catalytic performance of MXene based photocatalysts were discussed.The approaches of constructing MXene based separation membrane for separating pollutants and desalinating seawater were described in detail.Finally,the existing problems in the applications of MXene in the field of water treatment were summarized and analyzed,and the prospects of designing MXene based water treatment materials with excellent performance were put forward.
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Research progress in wire arc additive manufacturing of aluminum alloys
Qifei HAN, Rui FU, Jinlong HU, Yueling GUO, Yafeng HAN, Junsheng WANG, Tao JI, Jiping LU, Changmeng LIU
Journal of Materials Engineering    2022, 50 (4): 62-73.   DOI: 10.11868/j.issn.1001-4381.2021.000343
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Wire arc additive manufacturing (WAAM) attracts much attention due to its unique feature of rapid near net shape forming without die. It has the potential to become an advanced manufacturing technology that can break the bottleneck of alloy development and industrial application for aluminum materials. Wire arc additive manufacturing technology originates from traditional arc welding, and both of them use high-energy arc as heat source and metal wires as raw material. The WAAM technology and equipment development, the solidification and solid state phase transformation performance, microstructures, metallurgical defects as well as mechanical property of aluminum alloys were reviewed. The technique prospects of hot wire and multi-wire additive manufacturing, the unique fabrication manner and the exclusive phase transformation microstructure were discussed. The WAAM-specialized approaches to address the issues of poor manufacturing accuracy, serious porosity and cracking, and unsatisfied mechanical property, including fabrication system development, metallurgical defect controlling, alloy composition and microstructure design and heat treatment optimization were proposed. Such proposals are expected to facilitate the rapid development of high-end, customized and distinguished aluminum alloys via WAAM.

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Research progress in effect of element doping on electrochemical properties of Sr 2Fe 1.5Mo 0.5O 6-δ based anode materials
ZHANG Shao-wei, PU Xiu-hao, WAN Yan-hong, ZHU Kang, XIA Chang-rong
Journal of Materials Engineering    2021, 49 (9): 1-13.   DOI: 10.11868/j.issn.1001-4381.2020.001139
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Solid oxide fuel cell (SOFC) is a clean and efficient energy conversion device that can directly convert chemical energy to electricity.The state-of-the-art cermet anodes face various issues such as carbon deposition,sulfur poisoning and poor redox stabilities,which limit the application of SOFC. In order to avoid the problems of the cermet anodes,the perovskite anode materials with mixed electronic-ionic conductivities have drawn considerable attention in recent years.Among them,Sr 2Fe 1.5Mo 0.5O 6-δ perovskite has good stability,high conductivity,suitable thermal expansion coefficient and excellent electrochemical performance,and thus has been widely studied,especially element doping.The element doping was discussed at A-site, B-site and O-site of Sr 2Fe 1.5Mo 0.5O 6-δ perovskite,and the effects of doping elements and doping content on crystal structure,stability,electronic conductivity,thermal expansion and electrochemical performance were summarized.These doping strategies provide some novel ideas for modifying Sr 2Fe 1.5Mo 0.5O 6-δ perovskite anode,which can also be used to modify other similar perovskite anode materials.Finally, the development direction of Sr 2Fe 1.5Mo 0.5O 6-δ and typical ceramic anode materials was prospected. On one hand, the strategies of anion doping and co-doping could be adopted to improve the performance of ceramic anode materials. On the other hand,the mechanism of element doping will be further clarified through the combination of doping strategy and theoretical calculation.
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Research progress in tribological properties of high entropy alloys
Yuan YU, Zhuhui QIAO, Haibo REN, Weimin LIU
Journal of Materials Engineering    2022, 50 (3): 1-17.   DOI: 10.11868/j.issn.1001-4381.2021.000823
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In recent years, the sudden rise of high entropy alloys (HEAs) has become a hot research topic in the field of metal materials. The high entropy alloy is located in the central region of phase diagram, which has broad alloy composition space and possible formation of microstructure. The synergistic regulation of composition and preparation process can obtain richer structure. Unconventional chemical structure is expected to break through the performance limit of traditional anti-wear and lubricating alloys. In this work, the classification of wear-resistant HEAs was discussed. The effects of the addition of chemically active metals, soft metals and refractory metals on the wear resistance and lubrication properties of HEAs were analyzed. The effects of non-metallic elements and ceramic phases on the tribological properties of HEAs matrix composites were summarized. The effects of heat treatment and surface engineering technology on the surface microstructure and tribological behavior of HEAs were reviewed. The design method of HEAs with anti-wear lubrication under severe working conditions was discussed. The future research and application of HEAs in the field of friction and wear were prospected. High entropy alloys have great potential to solve the bottleneck problems of traditional alloys, such as to realize stable lubrication and anti-wear under extreme working conditions and to ensure anti-wear under specific functions.

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Progress in preparation and application of carbon nanotube composites based on MOFs
QIAO Jun-yu, LI Xiu-tao
Journal of Materials Engineering    2021, 49 (9): 27-40.   DOI: 10.11868/j.issn.1001-4381.2020.000599
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Carbon nanotubes(CNTs), as an important discovery in the research of nanomaterials, have become a research hotspot in the field of carbon materials since their birth. With its unique porous structure, metal-organic frameworks (MOFs) has been developed into one of the frontiers of research in recent years. With the continuous development of materials science in recent years, the research on composite technology of materials with different functional characteristics has become one of the main methods to solve key problems in the field of materials applications.CNTs and MOFs are two very important types of nanomaterials in the current material field. Combining the high electrical conductivity of CNTs with the high specific surface area and rich pore distribution characteristics of MOFs through composite technology is an inevitable trend for future research and application in the field of materials. In this paper, the main composite forms and preparation methods of MOFs and CNTs in recent years were reviewed, and the latest research progress of composites in the fields of supercapacitors, lithium battery electrodes, catalysis, adsorption, etc. was summarized. The synergistic improvement of the performance of the two materials was discussed and analyzed, and it was pointed out that the composite of CNTs and MOFs materials and the growth and distribution of CNTs have a high degree of randomness, and further control of them is the focus of future technical research.
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Demand for high performance materials in development of China's aerospace science and technology
ZHOU Yi-ren, SHEN Zi-cai, QI Zhen-yi, XUE Yu-xiong, HE Hong-bo, WANG Yan-zhi
Journal of Materials Engineering    2021, 49 (11): 41-50.   DOI: 10.11868/j.issn.1001-4381.2021.000129
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With the success of bringing back lunar samples, Mars exploration and space station construction, new requirements for high performance materials were put forward with the devel-opment of China's new space missions. Based on the analysis of the current situation and trend of China's aerospace development, some demands for high performance materials such as lightweight high performance structural materials, lightweight high efficiency thermal protection materials, structural & functional integration materials, new multifunctional composite protective materials, extreme temperature resistant functional materials, intelligent materials, high performance spacesuit materials, functional gradient materials, meta-materials, 3D printing materials and 4D printing materials were analyzed. Finally, nanotechnology, material genetic engineering and other new technologies were put forward to incorporate the space environment into the whole process of aerospace materials development and to further carry out the research and development of aerospace materials.
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Research status of graphene oxide composite coatings on magnesium alloys
CHEN Yan-ning, WU Liang, CHEN Yong-hua, CHENG Ling, YAO Wen-hui, PAN Fu-sheng
Journal of Materials Engineering    2021, 49 (12): 1-13.   DOI: 10.11868/j.issn.1001-4381.2021.000291
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Magnesium alloy has the advantages of low density, good damping and noise reduction and good electrical conductivity. It is the lightest metal structural material in applications. However, they are easily corroded due to the low potential of magnesium alloy electrodes, which limits their wide application in industry. At present, surface coating protection technology is one of the most effective methods to improve the corrosion resistance of magnesium alloys. Graphene oxide (GO) has excellent thermal, mechanical and barrier properties, and has broad application prospects in metal protection. GO-based composite coatings can provide a good physical barrier to corrosive media and have become one of the candidate materials for anti-corrosion coatings. In this article, the solutions were proposed for the limitations of single-component GO nanosheets, such as agglomeration and poor compatibility. The preparation methods, types and corrosion protection research progress of GO composite coatings were mainly summarized and its protection mechanism was analyzed in depth. Finally, the future development trend of GO application of magnesium alloy surface corrosion protection coating were prospected. The preparation methods and types of GO composite coatings on magnesium alloys were mainly described. The research progress and corrosion protection mechanism of GO coating on magnesium alloy were summarized.
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Research progress in graphene-based aerogel microspheres
LI Tian, ZHI Dan-dan, GUO Zi-hao, GUO Wei-lin, ZHANG Mei-ling, MENG Fan-bin
Journal of Materials Engineering    2021, 49 (11): 14-29.   DOI: 10.11868/j.issn.1001-4381.2021.000030
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In recent years, graphene-based aerogels (GAs) have been extensively studied owing to the excellent characteristics of low density, high specific surface area and porous structure, which show great potential in many applications. The disadvantages of traditional bulk graphene-based aerogels, for instance, strong device-dependence, large size and poor scalable production, limit their practical application and development. Meanwhile, conventional preparation techniques ignore the requirements of materials shape and size for specific application scenarios. As a new aerogels display form with novel structure, graphene-based aerogel microspheres (GAMs) not only have various advantages of GAs but possess properties of flexible and controllable size and scalable production, which tremendously enrich the application scenarios of GAMs.The fabrication methods and structure of GAMs, as well as the application fields of water pollution treatment, electromagnetic wave absorption and electrocatalysis were elaborated in this review.Meanwhile, the internal mechanism of GAS during molding assembly process was also pointed out.
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Progress in transparent bulletproof armor based on ceramics
LIU Jia-xi, SHI Xiao-dong, JIANG Liang-bao, LI Xiao-yu, WANG Min-bo, YAN Yue
Journal of Materials Engineering    2021, 49 (11): 30-40.   DOI: 10.11868/j.issn.1001-4381.2020.001117
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Requirements for the cockpit of military vehicles are constantly increasing as a result of escalating threats. The traditional transparent bulletproof armor based on glass have been unsatisfactory to relevant application requirements, and lighter and thinner transparent armor based on ceramics is becoming main option. Similar to other bulletproof armor, the main research fields of transparent bulletproof armor include:seek materials with higher performance for armor components; guide the structure design and ballistic test by experiment or computer simulation; understand the main performance of armor materials, the holistic performance of the armor system and the interaction between the components of the whole system more deeply. Based on this notion, the advantages and disadvantages, preparation technology, development, and application situation of the three kinds of ceramic materials commonly used in transparent armor were summarized. Among the three kinds of ceramics, sapphire has the best static parameters. As for the actual effect of bulletproof, the polycrystalline ceramics are better. The main reason for this phenomenon is that the different fragmentation modes of the two kinds of ceramics lead to the difference of projectile-target interaction effect. After that, the crack growth under high strain rate and bullet-proof property of single crystal, polycrystalline ceramics and glass were discussed. Under uniaxial, high strain rate compression, the crack propagation characteristics of materials are sensitive to impact energy/velocity. Polycrystalline ceramics has a composite failure mode of intergranular fracture and intragranular fracture. Under high energy impact, the damage zone of sapphire is similar to polycrystalline ceramics. Lower than critical energy, some sapphire plate orientations damage would be dominated. Finally, the material selection standards and structural design principles of each functional layer were summarized and prospected. Fine grain polycrystalline ceramic materials with high Young's modulus and high hardness are preferred for the strike-layer. Materials with good fracture toughness, high bending stiffness and the ability to localization of the damage within a narrow region should be selected for the intermediate layer. The materials of backing layer require ductility and low density. The bulletproof efficiency of the transparent-armor systems depends on the type and the degree of interaction/integration of different functional layers.
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Design, preparation and application of electrodes for flexible energy storage batteries
Ying HUANG, Chen CHEN, Chao LI, Jiaming WANG, Shuai ZHANG, Zheng ZHANG, Quanxing JIA, Mengwei LU, Xiaopeng HAN, Xiaogang GAO
Journal of Materials Engineering    2022, 50 (4): 1-14.   DOI: 10.11868/j.issn.1001-4381.2021.000512
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With the rapid development of portable and wearable electronic devices, research on flexible energy storage devices has gradually shifted to the directions of miniaturization, softness and intelligence. At the same time, people have higher requirements for the energy density, power density and mechanical properties of the device. As the core part of flexible energy storage devices, electrode material is the key to determining device performance. With the development of flexible energy storage electronic devices, there is an urgent need for new battery technology and fast, low cost and precise control of their microstructure preparation methods. Therefore, the research and development of new energy storage devices such as flexible lithium/sodium-ion batteries, flexible lithium-sulfur batteries, and flexible zinc-air batteries have become the current research hotspots in academia. The current research status of flexible energy storage battery electrodes in recent years was discussed in this paper, the design of flexible electrode materials (independent flexible electrodes and flexible substrate electrodes), and the preparation process of flexible electrode materials of different dimensions (one-dimensional materials, two-dimensional materials and three-dimensional materials) and applications of flexible energy storage electrodes (flexible lithium/sodium ion batteries, flexible lithium-sulfur batteries, flexible zinc-air batteries) were compared and analyzed, and the structural characteristics and electrochemical properties of electrode materials were discussed. Finally, the current problems faced by flexible energy storage devices were pointed out, and the future focus of flexible energy storage devices was the research and development of new solid electrolytes, the rational design of device structures and the continuous optimization of packaging technology.

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Research progress in the structure of multilayer composite electrodes for lithium-ion batteries
GAO Ke-xin, YU Tian-wei, QUAN Wei, CHANG Zeng-hua, LI Guo-hua, WANG Jian-tao
Journal of Materials Engineering    2021, 49 (10): 18-30.   DOI: 10.11868/j.issn.1001-4381.2021.000208
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With the rapid development of electric vehicles, people have higher requirement for the energy density and lifespan of power batteries. The cycle performance and rate performance of lithium-ion batteries can be effectively improved through the modification of the positive and negative active materials, the application of new conductive agents and binders, and the optimized design of the electrode group distribution ratio. However, the problems caused by the preparation process of the traditional electrode and the characteristics of the single-layer electrode structure put a limit on the further improvement of the performance of the lithium-ion battery. Therefore, solving the problems of the traditional single-layer electrode structure itself is an important direction of lithium-ion battery research. Three solutions to solve the problems of the single-layer electrode structure by analyzing the related research on the multilayer composite electrode structure were summarized in this paper which are increasing the stability of the electrode surface, increasing the conductivity of the electrode surface and adjusting the internal component distribution of the electrode, and they have their own advantages.By analyzing the characteristics and limitations of different schemes and preparation processes, new directions and ideas for electrode design and engineering application of lithium-ion batteries and other battery systems were proposed in this paper. Finally, the current research status of the multilayer composite electrode structure was summarized in this paper.
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Research progress in aluminum-based anti-icing surfaces
HE Zhi-wei, SHEN Zi-hang, QIU Huan-yi, CHEN Jia-hao, LIANG Li-jun, WANG Jian-jun
Journal of Materials Engineering    2021, 49 (9): 41-50.   DOI: 10.11868/j.issn.1001-4381.2020.000896
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Aluminum and aluminum alloys are widely utilized metal materials. When they are used as surfaces working below 0℃, the anti-icing protection is of great importance for the operation safety of facilities. Two types of aluminum-based anti-icing surfaces were introduced, including superhydrophobic surfaces and organic lubricating layers. First, methods of preparation of micro/nanostructures and surface energy lowering for aluminum-based anti-icing surfaces were discussed, followed by the summarization of their advantages and disadvantages. Then, the characterization of anti-icing performances for aluminum-based surfaces was introduced, including delay of droplets freezing and ice adhesion strength, by which the difference of the anti-icing performance of aluminum-based surfaces can be evaluated. In the end, it was put forward that the future research should be focused on the durability and sustainability of aluminum-based anti-icing surfaces during icing/de-icing cycles.
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Research progress in preparation and properties of refractory high entropy alloys
Xuan JIANG, Lin CHEN, Xuanhong HAO, Yueyi WANG, Xiaowei ZHANG, Hongxi LIU
Journal of Materials Engineering    2022, 50 (3): 33-42.   DOI: 10.11868/j.issn.1001-4381.2021.000582
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The meaning and characteristics of refractory high entropy alloys were briefly described, and the preparation methods of various refractory high entropy alloys (bulk, film and coating) were summarized.The comprehensive properties of refractory high entropy alloys were emphatically expounded. It was suggested that the composition design should be optimized by constructing a special database of refractory high entropy alloys, and the manufacturability of different preparation methods should be focused on. In view of the shortcomings of high room temperature brittleness, high density and high cost of refractory high entropy alloys at present, different preparation methods could be selected according to the properties of refractory high entropy alloys for future industrial application.

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Simultaneous control of curing time and curing quality of auto-clave processed composite based on optimization of temperature profile
TANG Wen-yuan, XU Ying-jie, SUN Yong-yi, ZHANG Wei-hong, HUI Xin-yu
Journal of Materials Engineering    2021, 49 (9): 142-150.   DOI: 10.11868/j.issn.1001-4381.2020.000716
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The temperature profile is an important process parameter for the autoclave curing of composite, which has an important influence on the curing time and the quality of the cured composite part. The curing period and curing quality of autoclave processed composite can be simultaneously controlled by the optimal design of the temperature profile. The numerical simulation of the curing process of a C-shaped composite part was carried out. The prediction results are in good agreement with the experimental test results, which verify the capability of the simulation method. Then, the temperature profile was optimized by using the design of experiment (DOE) method and particle swarm algorithm to achieve the simultaneous control of curing period and curing quality. Experiments were also carried out to verify the optimization results. The results show that the optimal design of temperature profile can effectively reduce the curing period and satisfy the constraints of curing uniformity, curing degree and curing deformation. The curing periods of the optimization cases are reduced by 64% and 45%, respectively.
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Isothermal phase transformation characteristics and mechanical properties of ultra-high strength β titanium alloy
WANG Qing-juan, WU Jin-cheng, WANG Wei, DU Zhong-ze, YIN Ren-kun
Journal of Materials Engineering    2021, 49 (9): 94-100.   DOI: 10.11868/j.issn.1001-4381.2020.000682
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Near β titanium alloy is widely used in automotive and aerospace industries due to their high strength-to-weight ratio and high corrosion resistance. The near β titanium alloy can precipitate ω phase and α phase after solution and ageing treatment, the strength of which can be remarkably increased, usually at the expense of ductility. It is one of the most important structural components of load-bearing that usually as aircraft skin, shell plating, main frame, linker and special fastener. The alloy used in this paper is a self-developed Ti-Al-V-Mo-Cr-Zr-Fe-Nb ultra-high-strength β titanium alloy, which is a typical near β titanium alloy. The characteristic of isothermal phase transformation of near β titanium alloys is diversity and complexity, which is sensitive to temperature and directly affects the mechanical properties after ageing. In this paper, the microstructural evolution and mechanical properties of a Ti-Al-V-Mo-Cr-Zr-Fe-Nb ultra-high strength β titanium alloy after isothermal treatment were investigated by scanning electron microscopy(SEM),transmission electron microscopy(TEM) and micro-hardness tester. The results show that only the isothermal ω precipitates are formed during ageing at 300℃, and the size of isothermal ω phases increase with the ageing time. The isothermal ω precipitates are first precipitated during ageing at 400℃. With the extension of the ageing time, the α phase nucleation occurs near the ω/β interface. No α precipitates are obtained in the alloy aged at 500℃, and needle-like α precipitates are directly precipitated from the β matrix, which is evenly distributed in the β matrix in a "V" shape. Tensile test shows that the tensile strength of the alloy is 1716.1 MPa and the elongation is 2% after ageing at 400℃ for 12 h. The tensile strength of the alloy is 1439.8 MPa and the elongation is 9.84% after ageing at 500℃ for 12 h, and has a good combination of strength and toughness.
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Synthesis of PI-MWCNTs flexible electrode material loaded on carbon cloth and its capacitive performance
WANG Yao, YAO He-xiang, YU Juan, WANG Xiao-dong, HUANG Pei
Journal of Materials Engineering    2021, 49 (9): 51-59.   DOI: 10.11868/j.issn.1001-4381.2020.000733
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Taking the preparation of electrode materials of supercapacitors, the study of properties and the performance of assembled asymmetric supercapacitors as the core contents, and improving the electrochemical performance of supercapacitors as the main purpose, the in-situ polymerization method was used to prepare carboxylated multi-walled carbon nanotubes (PI-MWCNTs) grafted polyimide solution, which is used as the precursor of nitrogen-doped carbon to realize the growth of composites on the surface of carbon cloth and as electrode material.Manganese dioxide-carbon cloth (MnO 2-CC) as the positive electrode, Polyimide-carbon cloth grafted with multi-walled carbon nanotubes as negative electrode (PI-MWCNTs-CC), build asymmetric supercapacitors. The structure and electrochemical properties of the electrode materials were characterized by scanning electron microscopy, raman spectroscopy, surface area and pore size testing, X line photoelectron spectroscopy, cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. According to the study, when the scan rate is 20 mV/s, asymmetric capacitor potential window can be increased to 1.3 V and its volume specific capacity is 1.80 F/cm 3.When the power density is 14.08 mW/cm 3, the energy density can reach up to 0.423 mWh/cm 3.
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Research progress in joining of carbon fiber-reinforced polymer composites and aluminum/magnesium alloys
JIN Qihao, CHEN Juan, PENG Liming, LI Ziyan, YAN Xi, LI Chunxi, HOU Chengcheng, YUAN Mingyang
Journal of Materials Engineering    2022, 50 (1): 15-24.   DOI: 10.11868/j.issn.1001-4381.2021.000524
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The lightweight of vehicles is one of the important means to solve the energy crisis and environmental problems, which has been paid great attention by scholars at home and abroad.Carbon fiber-reinforced polymer (CFRP) composites and light alloys such as aluminum and magnesium alloys have a series of excellent mechanical properties and processing performance, representing lightweight materials with great application prospects. It has become a hot research topic to realize the effective joining between the CFRP and aluminum/magnesium alloys which are the promising lightweight materials. However, due to the significant differences in physical and chemical properties between these dissimilar materials, the mixed application of a variety of lightweight materials in the production process is still facing great challenges.The research progress, advantages and disadvantages, and development trend of bonding, mechanical fastening, friction stir welding and its variants were summarized and analyzed. The micro morphology of joints obtained under different bonding methods was investigated. Three mechanisms of friction stir joining between CFRP and aluminum/magnesium light alloys were preliminarily summarized through investigating the micro morphology of joints, including macro anchoring, micro mechanical chimerism and chemical bonding. Finally, based on the above joining mechanism, it is pointed out that the key to further improving the performance of hybrid joints is to increase the surface roughness of the base metal, increase the area of the molten polymer and adopt the hybrid joining techniques.
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Research progress in wear resistance of high entropy alloy coatings prepared by laser cladding
Mingming JIANG, Shufeng SUN, Jin WANG, Pingping WANG, Xiaoyu SUN, Jing SHAO, Jixin LIU, Aixia CAO, Weili SUN, Xizhang CHEN
Journal of Materials Engineering    2022, 50 (3): 18-32.   DOI: 10.11868/j.issn.1001-4381.2021.000605
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The friction and wear of mechanical parts mainly occurs on the surface of the material, and about 80% of the failures of parts are caused by surface wear.Friction and wear increase the loss of material and energy, and reduce the reliability and safety.Using laser cladding technology to prepare a high entropy alloy coating on the surface of the substrate can achieve a good metallurgical combination between the coating and the substrate, so as to achieve the purpose of improving surface wear resistance.The main factors affecting the wear resistance of the high entropy alloy coating are the mechanical and physical properties of the coating material (such as hardness, plasticity and toughness), defects generated during the cladding process (such as surface roughness, pores and cracks), friction conditions (such as high temperature environment and corrosive environment).In this paper, the influencing factors and strengthening mechanism of laser cladding high entropy alloy coatings were reviewed and summarized.First of all, the influence of laser process parameters (such as laser power, laser scanning speed, spot diameter) and post-treatment processes (such as heat treatment and rolling) on the quality and performance of the coating were explained.Secondly, the influence of component element selection, high temperature environment and corrosive environment on the wear resistance of the coating was described.Finally, the problems existing in the preparation of high entropy alloy coatings by laser cladding technology were analyzed, and the future development trends were forecasted, such as developing new materials based on far-equilibrium material design theory, using electric field-magnetic field synergy or laser-ultrasonic vibration composite technology to improve the wear resistance of coatings, etc.

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Synthesis and properties of carbon nanofiber reinforced polyimide composite aerogels
ZHANG Ling, WANG Xue, LI Jiaqiang, LUO Chuyang, ZHANG Wei, ZHANG Liying
Journal of Materials Engineering    2022, 50 (1): 125-131.   DOI: 10.11868/j.issn.1001-4381.2021.000166
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4, 4'-diaminodiphenyl ether (ODA) and pyromellitic dianhydride (PMDA) were used as monomers. Carbon nanofiber (CNF) was used as the reinforcing agent. CNF reinforced polyimide (PI) composite aerogels were prepared with acidified CNF (a-CNF) via sol-gel process followed by freeze-drying technology. The morphologies, thermal insulation, microwave absorption as well as compression properties of PI composite aerogels were characterized. The results show that the volume of PI composite aerogels is shrunk from 45.52% to 35.32%, and the density is decreased from 0.084 g/cm 3 to 0.069 g/cm 3 with the increase of a-CNF content. The composite aerogels exhibit bigger pore sizes and wider pore size distribution after the introduction of a-CNF as well. CNF in PI matrix play roles for reducing the shrinkage of PI composite aerogels, thereby the thermal conductivity is reduced. Additionally, the reflection loss (RL) of PI composite aerogel with 15%(mass fraction) of a-CNF (15% CNF/PI) reaches -9.7 dB at 8.3 GHz. This is due to the fact that the introduction of CNF induced the conduction loss and the porous structure of aerogels provides better impedance matching. The compressive strength and modulus of PI composite aerogels with 15% of a-CNF content are increased by approximately 1.5 times and 2 times compared with pure PI aerogel, respectively.
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Transformation characteristics of γε-M and ε-M→ α'-M in high manganese steel under high speed compression
WANG Li-na, LI Zhi-chao, WU Xiao-long, MA Dan-dan, YANG Ping
Journal of Materials Engineering    2021, 49 (9): 101-108.   DOI: 10.11868/j.issn.1001-4381.2021.000323
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The volume fractions of γ (austenite), ε-M (hcp martensite) and α'-M (bcc martensite) in static and high speed compressed high manganese transformation induced plasticity (TRIP) steel were calculated by the XRD technique to investigate the effect of strain rate on the kinetic characteristics of γε-M and ε-M→ α'-M transformation. Orientation dependence of γε-M and ε-M→ α'-M transformation in high speed compressed specimen was analyzed by the EBSD technique and the calculation of martensitic transformation crystallography. The results show that the effects of strain rate on γε-M and ε-M→ α'-M transformation are different. Compared to static compression, the γε-M transformation is inhibited due to the higher stacking fault energy, and ε-M→ α'-M transformation is promoted because higher stress during high speed compression. Compared to static compressed specimen, martensitic transformation is accelerated at the early stage of high speed compression. High speed compressed specimen shows orientation dependence of martensitic transformation, which is related to the mechanical work of martensitic transformation in differently orientated γ grains. γε-M phase transformation is only related to the mechanical work of ε-M; ε-M→ α'-M phase transformation depends on the mechanical work of both ε-M and α'-M.
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Research progress in special wettable nanofibrous membranes for oil/water separation
ZHAO Xin, REN Bao-na, HU Miao-miao, PI Hao-hong, ZHANG Xiu-qin, WU Jing
Journal of Materials Engineering    2021, 49 (10): 43-54.   DOI: 10.11868/j.issn.1001-4381.2020.001054
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The oil/water mixture is sepearated and then treated, it can not only realize the reuse of oil and water resources, but also effectively avoid the environmental pollution caused by directly discharging. Therefore, it is particularly important to do research on the materials, which is used to separate the oil/water mixture for saving resources and protecting the environment. Among them, the special wettable nanofiber membranes with superhydrophobic/superoleophilic or superhydrophilic/superoleophobic have attracted substantial attention in the application research of oil/water separation. In this review, the theoretical basis of special wettability and the applications of electrospinning nanofiber membranes were described. The research progress of special wettable nanofiber membrane materials in oil/water separation field was summarized. Finally, it was pointed out that in the oil-water separation process, the fine microstructure on the special wettability nanofiber membranes is easily damaged by mechanical damage and chemical pollution, which greatly limits its applications in oil-water separation. At the same time, the future of the special wettable nanofiber membrane materials was briefly discussed.
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Micro-alloying influence in microstructure evolution and mechanical properties of TiB 2 particle reinforced aluminum matrix composites: a review
XUE Yan-qing, LI Bo, WANG Xin-liang, ZHANG Han, HAO Qi-tang
Journal of Materials Engineering    2021, 49 (11): 51-61.   DOI: 10.11868/j.issn.1001-4381.2021.000078
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Micro-addition of alloying elements is not only an effective method to improve the overall performance of aluminum matrix composites but also a proven workable low-cost technology in improving the reinforced phase/matrix interface structure and regulating the mechanical property of strength-toughness other than the physical processes such as electromagnetic stirring and ultrasonic vibration, as well as preparation technologies like bimodal structure and biomimetic layered materials, etc. In recent years, the research of alloying elements in TiB 2 particles reinforced aluminum matrix composites has attracted much attention and achieved remarkable results which lay a good foundation for better understanding of its mechanism on the nano-level or even the atomic level. A series of latest developments on the properties of TiB 2/Al composites by adding alloying elements at home and abroad were summarized, i.e. TiB 2 particle morphology, microstructure and mechanical properties.The mechanism of micro-alloying and its prospect on regulating crack initiation and propagation, exerting intrinsic mechanical properties of micro and nano scale, along with coordinating the dilemma of strength-ductility trade-off were also forecasted, aimed at providing reference for the preparation of high-performance aluminum matrix composites.
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Research progress in tribological property of dental ceramics
Lei LEI, Yuchi WU, Zijin CHENG, Li LIU, Jing ZHENG
Journal of Materials Engineering    2022, 50 (2): 1-11.   DOI: 10.11868/j.issn.1001-4381.2021.000295
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Ceramics are widely used as dental restorative materials because of their superior wear resistance, chemical stability, biocompatibility, and aesthetic features. In this paper, the chemical compositions, microstructures and mechanical properties of dental ceramics were introduced, based on the wear mechanisms of typical dental ceramics and their abrasiveness with opposing human teeth, the main progress concerning the tribological performance optimization of dental ceramics were summarized, and it was pointed out that the mismatch of tribological properties between ceramics and human teeth seriously restricts the clinical application of dental ceramics. Then the in vitro test methods of tribological properties of dental ceramic materials are analyzed and summarized from the aspects of laboratory test medium, friction pair, load, displacement and cycle times. Finally, the future development trends of dental ceramics were discussed from the perspective of bionic tribology. It was pointed out that bionic design of ceramic matrix composites is a promising strategy for overcoming the mismatch of tribological property between dental ceramic restorations and human teeth.

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Preparation and performance of polyacrylonitrile-based nanofiber separator on surface of graphite electrode
XIAO Wei, YANG Zhan-xu, QIAO Qing-dong
Journal of Materials Engineering    2021, 49 (9): 60-68.   DOI: 10.11868/j.issn.1001-4381.2020.000703
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In order to make full use of the porous structure and overcome the shortcoming of low mechanical strength of nanofiber-based separators, polyacrylonitrile (PAN) separator was prepared directly on the surface of graphite anode by the electrospinning method. And an integrated separator/anode assembly (SAA) was formed. The microstructure, mechanical strength, electrolyte wettability, thermal resistance and battery performance were systematically investigated. The results show that the nanofibers in PAN separator are tightly bonded to the rough surface of graphite anode, resulting in a well-integrated interface structure (tensile strength higher than 200 MPa). Compared with polyolefin separators, SAA exhibits better electrolyte affinity and higher ion conductivity (1.9 mS/cm). The above advantages endow the LiCoO 2/SAA full cell with better C-rate (capacity retention 44.3% at 32 C compared with that at 0.5 C) and cycling performances (capacity retention 98% after 200 cycles at 0.2 C) compared with those of LiCoO 2/polyolefin separator/graphite battery. Consequently, this work provides an advanced separator/anode assembly and the corresponding fabrication method, which may be a new strategy for improving the charge-discharge performance and assembly efficiency of lithium-ion batteries.
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Ag/ZrO 2/C flexible nanofiber films-based counter electrode for perovskite solar cells
GU Ning-xia, JING Wan-ru, NING Lei, LYU Fang-jie, SONG Li-xin, XIONG Jie
Journal of Materials Engineering    2021, 49 (9): 79-86.   DOI: 10.11868/j.issn.1001-4381.2020.000719
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Perovskite solar cells(PSCs) are paid much attention due to simple preparation and high photoelectric conversion efficiency. Carbon nanofiber films(CNFs) prepared by electrospinning have high specific surface area, electrical properties and chemical stability, but the application in PSCs is limited due to their brittleness. The flexible and conductive Ag/ZrO 2/C composite nanofiber films were prepared by electrospinning and hydrothermal method. After that, it was applied as the counter electrode of flexible PSCs and the effect of Ag nanoparticles with different concentrations on the performance of the composite nanofiber films and the PSCs were studied. The results show that when the concentration of precursor solution rises from 0 g/mL to 0.030 g/mL, the coating effect of Ag nanoparticles on the Ag/ZrO 2/C composite nanofiber improves obviously and all the composite nanofiber films display the excellent flexibility and modulus of elasticity (0.479 MPa), meanwhile, the conductivity of the films increases from 866 S/m to 4862 S/m, so as to enhance the hole-electron transport capacity of the films and the performance of flexible PSCs. When the solution concentration is 0.030 g/mL, the PSCs have best photoelectric conversion efficiency(PCE) of 6.05% and optimal current density (18.44 mA/cm 2). It is of great significance to further improve the performance of flexible PSCs and the application of flexible carbon nanofiber films.
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Research progress in corrosion resistance of biomedical magnesium alloys
WANG Rong-xiang, HONG Li-xin, ZHANG Xiao-bo
Journal of Materials Engineering    2021, 49 (12): 14-27.   DOI: 10.11868/j.issn.1001-4381.2021.000292
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Biomedical magnesium alloys exhibit high specific strength, low density, proper elastic modulus, biodegradability,good biocompatibility and biomechanical compatibility,thus show extensive application perspective in bone fixation and cardiovascular stent.However, fast and nonuniform corrosion of magnesium alloys may easily cause the premature loss of mechanical integrity that restricts their clinical application in load bearing. In this paper, the research progress of magnesium alloys was systematically reviewed from the aspects of corrosion modes, the intrinsic and external factors affecting corrosion resistance, improvement of intrinsic corrosion resistance and surface modification, and the future development trend of corrosion resistance of biomedical magnesium alloys was prospected. On the one hand, the corrosion resistance of magnesium alloys can be improved by means such as low alloying, high purification and fine crystallization. On the other hand, reliable coatings are designed from the aspects of corrosion resistance, antibacterial and drug loading. In addition, corrosion media, flow field, stress and other in-body service factors should be considered comprehensively to study the corrosion degradation behavior and mechanism of magnesium alloy implanted devices.
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Research progress in application of two-dimensional nanomaterials MXenes and its composites in electrocatalysis field
WANG Jiajia, YU Lanlan, HU Xia, LIU Baojun
Journal of Materials Engineering    2022, 50 (1): 43-55.   DOI: 10.11868/j.issn.1001-4381.2020.001060
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MXenes, as a new 2D transition metal carbides/nitrides/carbonitrides, have wide potential application in physics, chemistry, material science and nanotechnology fields. Since MXenes inevitably possess defects and —O, —OH, —F terminal groups during the preparation, behaving high conductivity and large surface area, MXenes have a good electron transfer rate and can be used as an excellent electrochemical catalyst. In this review, the various synthesis methods and development of different doping types of MXenes were introduced. The application and mechanism of MXenes in electrocatalytic hydrogen production, oxygen production, oxygen reduction, CO 2 reduction and nitrogen reduction processes were mainly discussed. It was pointed out that the preparation methods of MXenes should possess the characteristics of environmental friendliness, morphology controllability, the inoxidizability and high adjustability, meanwhile, different types of MXenes should be applied to different electrocatalytic reactions.
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Research progress in preparation of conductive yarn and its application in smart wearable devices
MA Pei-pei, LI Long, WU Lei
Journal of Materials Engineering    2021, 49 (10): 31-42.   DOI: 10.11868/j.issn.1001-4381.2020.000460
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With the development of electronic information technology and people's pursuit of convenient life, smart flexible wearable devices have attracted the attention of many scholars. In the development of smart wearable devices, flexible conductive materials play a vital role. As the most basic flexible conductive textile material, conductive yarn is widely used in smart wearable products. However, most traditional textile materials are insulating materials and cannot directly form conductive yarns and smart wearable products. The preparation methods and application research progress of metal-based conductive yarns, carbon-based conductive yarns, and conductive polymer-based conductive yarns, as well as the application research progress in wearable strain sensors, wearable supercapacitors, wearable electric heating devices and other aspects were introduced. The problems that need to be solved in the research of conductive yarns in recent years were analyzed, mainly including improving the conductivity, flexibility and environmental stability of conductive yarns. In addition, in view of the convenience, comfort, washing durability, and sensitivity required by smart wearable devices, it was proposed that the sensitivity, durability of flexible conductive yarn and the combination of textile materials and conductive materials have become the main development of wearable flexibles smart product.
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Research progress in formation mechanism of precursor film at high temperatures
Lu LIU, Wenqi ZHU, Qiaoli LIN
Journal of Materials Engineering    2022, 50 (5): 1-10.   DOI: 10.11868/j.issn.1001-4381.2021.000277
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The formation mechanisms of the precursor film (PF) at high temperature were reviewed, i.e., surface diffusion mechanism, evaporation-condensation mechanism, subcutaneous infiltration mechanism, and rapid absorption then film overflow mechanism. In the experimental metallic systems, the most possible mechanism is the subcutaneous infiltration mechanism, which is related to the apparent contact angle, contact radius, height of gap between the substrate metal and oxide film. In the metal/ceramic system, the formation of precursor film is usually rapid absorption then film overflow mechanism. The appearance of PF for adsorption mechanism needs to meet the contradiction of relative inertia and high affinity at the liquid/solid interface. Meanwhile, another possible mechanism of precursor film in high temperature reactive wetting system, namely film transport mechanism, is introduced. It was pointed out that the difficulty of studying precursor film lies in the unpredictability and instability of precursor film, and its development direction should be systematic, and the corresponding theoretical model should be established.

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Antibacterial and oil-water separation applications of Bi 2O 3 coating with reversible wettability
YU Fang, HU Xiao-jing, TANG Qi-jin, XIA Yu-piao, LYU Zhong, YANG Hao
Journal of Materials Engineering    2021, 49 (9): 167-174.   DOI: 10.11868/j.issn.1001-4381.2020.000654
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The application of materials with special wettability is a hot research topic in recent years. It is reported that Bi 2O 3 coating with hydrophobic modification could achieve the reversible conversion of superhydrophobicity to superhydrophilicity under UV-visible light irradiation and dark storage. Based on this finding, the application of Bi 2O 3 coating in antibacterial and oil-water separation under different wettability was studied. The results show that superhydrophobic surface exhibits good bacterial anti-adhesion effect against E.coli and S.aureus, while superhydrophilic surface shows selectively antibacterial activity. In terms of oil-water separation, the superhydrophobic surface can block water and allow oil pass through the filter with the separation efficiency more than 93%, while the superhydrophilic surface can block oil and allow water pass through the filter after pre-wetting treatment. Therefore, Bi 2O 3 coating with reversible wettability can be used as an intelligent antibacterial membrane material for oil-water separation, which has potential application in the field of oil-water separation.
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Preparation and properties of polysilizane/BN composite thermal-resistant coating
WAN Yao-ming, LI Jing, LIANG Lu, XIONG Yu, WANG Yan
Journal of Materials Engineering    2021, 49 (10): 116-122.   DOI: 10.11868/j.issn.1001-4381.2020.000359
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Composite coatings were prepared by using polisilizane as matric resin and h-BN as functional filler.Raw BN was modified by chemical method to improve its distribution in composite coatings.FT-IR and TEM characterizations were applied to analyse the chemical structure of the raw BN and modified BN samples.SEM was used to observe the microstructure of the as-prepared coatings.The optimal resin content was set as 50% (mass fraction) by characterizing the microstructure of composite coatings with varied resin contents. In addition, basic properties of composite coatings were also tested and analysed.The results show that raw BN is successfully modified using chemical method.The modified BN displays better distribution in composite coatings as expected.The as-prepared coatings have good impermeability and thermal-oxidation resistance.
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Anti-high speed impact properties of carbon fiber/bismaleimide resin composites
GU Shan-qun, ZHANG Dai-jun, FU Shan-long, LIU Yan-feng, LI Jun, ZOU Qi, CHEN Xiang-bao
Journal of Materials Engineering    2021, 49 (11): 73-82.   DOI: 10.11868/j.issn.1001-4381.2019.001234
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The carbon fiber/bismaleimide resin composites were prepared by the autoclave molding process. Effects of carbon fiber type and volume fraction of carbon fiber on the high speed impact properties were investigated by air cannon impact testing machine, ultrasonic C-scanner and electronic universal material testing machine. The results demonstrate that the anti-high speed impact property of TZ1000G carbon fiber reinforced composites is superior to that of the CCF300 carbon fiber, CCF700S carbon fiber and CCF800H carbon fiber reinforced composites. Also, the volume fraction of carbon fiber can improve the anti-high speed impact property of the composites. Meanwhile, the results also indicate that failure modes are highly dependent on the impact velocity. Specifically, when the impact velocity is low, a circular pit with fiber delamination appears around on the impact surface of the composites while delamination appears on the back surface along the fiber direction. Also, when the impact velocity is high, a circular hole with fiber delamination around is formed on the impact surface of composites, and the tearing fracture is observed on the back surface.
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Effect of hygrothermal environment on mechanical properties of T800 carbon fiber/epoxy resin composites
ZHOU Song, JIA Yao-xiong, XU Liang, BIAN Yu-bo, TU Yi-ming
Journal of Materials Engineering    2021, 49 (10): 138-143.   DOI: 10.11868/j.issn.1001-4381.2020.000954
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The hygrothermal aging test of T800 carbon fiber/epoxy resin composites was carried out. Through mass change, surface morphology before and after aging, dynamic mechanical properties, infrared spectroscopy, interlayer shear and compression tests, the effects of solution immersion in deionized water and 3.5% (mass fraction, the same as below) NaCl solution at 70℃ on the mechanical properties of carbon fiber/epoxy resin composites were studied. The results show that the moisture absorption rate of T800 carbon fiber/epoxy resin matrix composite is relatively low in deionized water and 3.5%NaCl solution, which is 0.82% and 0.67%, respectively; Good adhesion between unaging sample fiber and matrix, after aging in 3.5%NaCl solution, the interface damage between fiber and matrix is more serious than that in deionized water. After immersion in deionized water, the shear strength is decreased by 8.8%, the compressive strength is decreased by 4.3%. After soaking in 3.5% NaCl, the shear strength is decrease by 10.1%, the compressive strength is decreased by 4.7%. The T g of the samples decreased after aging in the two solutions, but the difference is not significant, at the same time, no new substances are generated or chemical reactions occur. The research results provide a basis for the application of T800 carbon fiber/epoxy resin composites in corrosive environment.
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High temperature oxidation behavior of refractory high entropy alloys NbMoTaWTi/Zr
WANG Xin, WAN Yi-xing, ZHANG Ping, SHAN Cai-xia, XIE Ying-ying, LIANG Xiu-bing
Journal of Materials Engineering    2021, 49 (12): 100-106.   DOI: 10.11868/j.issn.1001-4381.2020.000917
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Refractory high entropy alloys NbMoTaWTi and NbMoTaWZr were prepared by vacuum arc melting.The microstructure and component distribution characteristics were analyzed, and the dynamic behavior during room temperature to 1500℃,as well as the isothermal oxidation behavior at 1200℃ were studied. Results reveal that NbMoTaWTi mainly consists of single body-centred cubic (BCC) phase, and NbMoTaWZr is composed of BCC and Zr-rich phases.These two alloys are both seriously oxidized above 700℃. Comparatively, NbMoTaWTi alloy is superior to NbMoTaWZr in antioxidation below 1300℃.For both two alloys, the oxygen diffusion inward mainly occurs during isothermal oxidation at 1200℃ and catastrophic oxidation takes place after 3 h. The Ti and Zr addition cannot cause selective oxidation. Although these two elements form a composite oxide layer with other refractory metal oxides, the density and the ability to prevent oxidation is not enough.
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Progress in application of nanomaterials mimic enzymes
Peng WU, Cheng CHEN, Xueling ZHAO, Donghai LIN
Journal of Materials Engineering    2022, 50 (2): 62-72.   DOI: 10.11868/j.issn.1001-4381.2021.000073
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Natural enzymes are trace proteins produced by living cells in human body. It is precisely because of the existence of enzyme that the daily operation of organisms can be carried out orderly. At present, enzymes are used in many fields such as biomedicine, catalysis and detection. However, natural enzymes have many disadvantages, such as easy inactivation, poor stability, difficult synthesis, complex purification and high price, which hinder the large-scale application. In the past decades, as a new generation of artificial enzymes, nanomaterials mimic enzymes has gradually become a substitute for natural enzyme due to their high stability and good repeatability. Nanomaterial mimetic enzymes play an important role in many fields. The application of nanomaterial mimetic enzymes in the detection of O2·- and salvianolic acid in the field of electrochemical sensing was focused on in this paper, as well as in the detection of small biological molecules such as glutathione, glucose, cholesterol and H2O2, which can effectively detect the content of heavy metal salts and pesticides in the field of environmental pollution prevention and control, nanomaterials mimic enzymes can also prevent cancer, virus infection and other diseases by detecting specific sequences of DNA. Finally, it was expected that the future research of nanomaterials mimic enzymes will focus on the coupling between nanomaterials mimic enzymes, reaction mechanism, optimization of enzyme reaction environment and substrate selectivity, which will be the key research direction in the future.

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Tribology research progress of functional fillers modified polymer materials
Changxin WAN, Shengpeng ZHAN, Hui CHEN, Yinhua LI, Dan JIA, Jian LI, Haitao DUAN
Journal of Materials Engineering    2022, 50 (2): 73-83.   DOI: 10.11868/j.issn.1001-4381.2021.000435
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Polymer materials are widely used in the mechanical lubricant field owing to their light, low-cost, anti-corrosion, and excellent self-lubricating performance. Adding functional fillers with anti-friction and reinforcing character can overcome the inherent defects of intrinsic polymer materials and then obtaining tribological composites materials with the low friction coefficient, high-wearing, high-bearing, and heat-resisting performance. The anti-friction and anti-wear effect and mechanism of composites by adding functional fillers such as carbon-based materials, transition metal sulfides, microcapsules, soft metals, ceramic nanoparticles, mineral salts, and self-lubricant polymer materials were summarized in this paper. Meanwhile, the mechanical property is the key parameter that can guarantee the service performance and application deadline of polymer materials and also gives the significant influence of tribological performance. The enhanced and toughening mechanism of composites by adding nanoparticles and fiber was also mainly discussed in this paper. Finally, The synergistic effect of functional fillers on mechanical and tribological properties was prospected, as well as the development trend of computer simulation in tribology of composite materials.

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